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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09314ea6459559ed1570328a91d62d018190f7ca2d746b4b9fea03d8dce67f8' 
  AND token = 'RALNArkRFMVo+/Xa4vg4/hPhAYatXKtg+b4EpcatGj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}